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burnin oil · 04-25-2020, 10:49 AM

I would be tempted to flip that manifold to get the exhaust further away from the heater box. Its not uncommon to 1500 degrees on a hot rod Cummins and that exhaust housing will hold a good bit of it for some time. Its been a few years but I want to say my 12v was around 650 degrees EGTs cruising on somewhat level ground.

04-25-2020, 10:49 AM	#6
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,919	Re: C30 first gen cummins swap part what did you use for... I would be tempted to flip that manifold to get the exhaust further away from the heater box. Its not uncommon to 1500 degrees on a hot rod Cummins and that exhaust housing will hold a good bit of it for some time. Its been a few years but I want to say my 12v was around 650 degrees EGTs cruising on somewhat level ground.